Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf930af27604746…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 22:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 95f8d1bb3a122735b5135497a3766907 SHA-1: 42ca71b13ecfe954e231bf5b0578923bd75ec654 SHA-256: 2cf930af27604746cf71c57fed651cf146d4281b8d39ecd43326aa40b148b040
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site that exploits PDF vulnerabilities or hosts further malware. No scripts were extracted, but the presence of many external links points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/wix?keyword=parts+of+an+atom+worksheet+answers+physical+science+if8767 PDF link annotation
    • http://fisitupogavi.mypressonline.com/85547682660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6027760a03ace.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/etggibG/cinelux_theater_morgan_hill_movie_times.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_60555233aa7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6011d79e79402.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/4.03_judicial_opinion_template.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/statistical_learning_springer.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/lirumomupinijurekimelitub.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/where_is_the_setting_of_the_story_pandoras_box.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/56340678214.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/jusamadebafotopitipaxewuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_6034d6593f03d.pdfIn PDF document text
    • https://cdn.sqhk.co/jagejope/esKejiI/descargar_five_nights_at_horror_island.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilowovuv.atwebpages.com/fusionner_2_adobe_reader_xi.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/journey_to_the_centre_of_the_earth_1959_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/android_imageview_animation_xml_example.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/23968572168.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/case_study_sample_for_psychology.pdfIn PDF document text
    • http://liwumakagizir.rf.gd/ruzigarakebikegakes.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/bard_guide_3.5.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5940 bytes
SHA-256: 5ae19336d81c31a2994bfeddaa55b2c2a671e5e58feea636848929b413caf909
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 10796 bytes
SHA-256: 182425aa70ed084827e7dcd10e66d6f83478103f98e6e1ec2a28ab5b1bbdc111

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